easyeqn – A simple package for writing equations

In­tro­duces some equa­tion en­vi­ron­ments that sim­plify writ­ing of
equa­tions. It uses a syn­tax sim­i­lar to the ar­ray en­vi­ron­ment
to de­fine the col­umn align­ment. A pack­age op­tion causes
only those equa­tions that were la­belled and ref­er­enced to be
num­bered. Some type­set­ting sup­port is also pro­vided.